Parallel drop-bracket for gas



i UNITED STATESI PATENT Oriuca;l

JAMES E. TREAT, OF BOSTON, MASSAOHUSETTS.

PARALLEL DROP-BRACKET FOR VGAS, 84.0.

SPECIPICATION forming Apart of Letters Patent No. 338,117. dated March16, 1886. Applicatioii filed December '7, 1885. ``Serial No. 184,92. (Nomodel.)

To all whom it may concern:

Be it known that I, JAMEs E. TREAT, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented certain new and useful Improvements in ParallelDrop-Brackets` for Gas, &o; and I do hereby declare that the same arefully described in the following specification and illustrated intheaceompanying.

drawings.

This invention relates to improvements in parallel drop-braeket-s forgas or other purposes-such as, for inst-ance, for adjusting andsupporting oil or electric lamps, as an adjustable tool-holder fordentists7 use, or for. other purposes where it is desirable to quicklyad-.

just the position of the arm or bracket up and down, and to secure it inthe desired position after being adjusted. Besides being verticallyadjustable, the pipes or arms are hinged together, as is usual ongas-fixtures. so that the drop-bracket can be swung sidewise with per-land Fig. 3 represents a cross-section on the line A B, shown in Fig. 2.V

Similar letters refer to similar parts wherever they oecur on thedifferent parts of the drawiugs.

a is a metal back plate, (or of other material, if s'o desired,) that issecured to the wall or other object by means of screws or otherfastening devices.

If the invention is applied for gas-fixtures, I prefer to make aperforation in the upper end of said plate a, through Which passes thesereW-threaded end of the gas-pipe b, to which is screwed the cock c,the latter being preferably made With a flange or collar, c', that issecured to plate a by means of a screw, o, Fig. 2, to prevent thefixture from working loose on the gas-pipe b, to which the cock isserewed.

To the outer end of cock c is universally jointed the arm or pipe bymeans of the angle e, the vertical leg of which is journaled in avertical socket, 03, in the end of coek c, and the horizontal leg ofsaid angle e being j ournaled in a socket, d', on the inner end of armor pipe d, in the usual manner of oonstructing Universal joints forgas-arms. The outer end of arm or'pipe d is universally jointed to armor pipef by means of angleg, having its horizont-al leg journaled in asocket, d, Secured to outer end'of pipe or arm d, and its vertical legjournaled in the socket f', seeured to pipe or arm f, to the outer endof which is secured the gas burner h, or a I table, toolholder, or otherdevice, as may be desired.

To the under side of socket 03 is screwed or otherwise seeurcd thebearing-piece C, the

axis of which is arranged in a line with the/ 7 axis of the verticalbore in said socket ti, as

shown in Fig. 2. The lower end of bearingpiece O is provided with acylindrical vertical recess, C', in which is inserted the uppercylindrical trunnion, i, of the ratchet-bar I, the latter having in itslower endthe cylindrical trunnion i', supported in and capable ofturning in a cylindrical recess,k', in the projection or bracket K,secured in asuit-able manner to the plate a, as shown in Fig. 2.

TheIratchet-bar I isshown as provided W 1511" j.

teeth i'z' on one side, and allowed to turn around its vertical aXis inthe bearings O' k; but I do not wish to eonfine myself to this exactarrangement, for, Vif so desired, the

ratehet-bar I may be made stationary, in which case I make it in theformof a cylindrical rod with annular teeth, grooyes, or projections,although in practice I prefer to make it and support it in the manner asabove described, and as shown in the drawings.

On the ratchet-bar I is vertieally adjustable the looking-sleeve L,provided in front With a tooth orl looking projection, Z, adapted tolock in any of the teeth on the ratchet-bar I, and provided with aspring, Z', secured to the rear interior portion of sleeve L, andpressing against the back of ratchet-bar I, as shown in Fig. 2, so as tocause the tooth or projection Z to automatically lock in one of theteeth on the ratchet-bar I as soon as the operator releases his hold onsaid looking-sleeve L.v

The internal ehamber in sleeve L is' preferably made ta'per-ing-that is,of proper size in its upper end to fit loosely on the ratchet-bar I,anduenlarged suffieiently in its lower end to permit the looking toothor projection Z to be disengaged from the teeth on ratchet-bar I IOOwhen the operator presses the lower end of sleeve L forward against theinfluence of spring 'Z".

A'nyother suitable looking and releasing devlce may be used inconnection with the ratchet-bar I without departing from the esv senceof my invention, but I prefer to use the one shown and-described, as itis very simple 1n construction, and will automatically lock on theratchet-bar as soon as the operator lets go the pressure on sleeve L,and thus prevent 1ts accidental dropping.

To the sleeve L is hinged at Z the link or rod M, the upper end of whichis hinged at m' to the block N, located on the pipe or bar d, andpreferably made adjustable thereon, and secured in place by means of aset-screw, n, as shown in Fgs. 1 and 2.

By making the block N adjustable on pipe or armd it can be set andsecured to such arm in 1ts proper position, so as to compensate for anyinaccuracy in the lengths of links O and M, or either of them, so as toobtain a horizontal, or nearly so, position of the outer arm, f.

O is a link or connecting-rod arranged parallel, or nearly so, with andbelow the pipe or bar its rear end being hinged at m to the hnk M, at aplace between the fulcra Z and m, as shown in Fig. 2. The forward end ofconnecting-rod O is hinged at g' to a lever or proJectlon, G, securedtov or made in one piece wlth the angle-piece y, as shown.

The full lines in Fig. 2 show the fixture in a horizontal, or nearly so,position. In dotted llnes in said figure the arm or pipe dis shown asdropped more or less, as may be desired, leaving the outer pipe or bar,f, in a horlzontal, or nearly so, position.

As the bearings for the ratchet-bar I are located centrally below thesocket 03, it will be readily understood that the arm d can be swung tothe right or left with perfect ease, whether the fixture is in o rintermediate position.. It will also be noticed that the armf may beswung to the right or left with the arm d, or independent of it, as maybe desired, in" any position of the latter.

If the fiXture is in the position shown in full lines in Fig. 2, and itis desired to lower it, all that is necessary to do is to press for-Ward on the rear of the lower portion of sleeve LI against the influenceof spring Z' until the p1n or projection Z is carried free of the teethi, When the arm d will be caused to swing downward by its own'weight onthe horizontal leg of angle e until the desired inclination is reached,when the pin Z will automatically lock in one of the teeth on theratchet-bar I as soon as the operator relieves his pressure on the rearof the sleeve i L. During such downward motion of sleeve L the rod O isgradually moved outward by its connection to its highest, lowest,

link M, and in so doing it turns the angle q on its horizontal leg, soas to retain the pipe or arm f ina horizontal, or nearly so, position,no matter how much the arm is swungup or down, as limited by the sleeveL on the bar I.

The pipe or arm f is raised by releasing sleeve L from ratchet I andraising sleeve L to the desired position, where it is automaticallysecured as soon as the operator releases his hold on sleeve L. Havingthus fully described the nature, construction, and operation of myinvention, I wish to secure by Letters Patent, and claim- 1. Thecombination of a supporting-plate, a, having a stationary socket, ca,and a bracket, K, a looking-bar, I, supported thereby, the inner arm,joined to said socket, the outer arm,f, jointed to the inner arm andhaving an attached lever, G, a link, O, Connected at one end with saidlever, the link M,connected intermediate its ends to the link, alockingsleeve, L, located on the looking-bar and connected with one endof the link M, and a sliding connection between the other end of thelatter link and the inner jointed arm, substantially as described.

2. In a bracket, the stationary socket c3,and the looking-bar I,arranged centrally below it and provided with looking device L, combinedwith the link M,hinged to such locking device and to the arm ,in amanner and for the purpose as set forth.

3. The combination, in a bracket, of a supporting-plate, a, alooking-bar, I, supported. thereby, the inner arm, d, having a jointedconnection with the plate, the outer arm, f, jointed to said inner arm,the lever G, connecting-link O, link M, and looking device L, ConnectedWith the latter and arranged on the looking-bar, substantially asdescribed.

4. The combination of the stationary socket .03, the looking-bar I, theadjustable lockingsleeve L thereon, the arm d, jointed to said socket,the Imovable block N on said arm, and the link M, Connected with theblock and the looking-sleeve, substantially as described.

5. The combination of the stationary socket c, the bracket K, thelooking-bar I, supported by said part-s, the looking-sleeve on the bar,.the inner arm, d, jointed to the socket, the

-link M, Connected with the sleeve and having a sliding connection Withthe inner arm, the outer arm, f, hinged to the inner arm and having 3theattached lever G, and the link O, connectingsaid lever with the link M,substantially as described.

In testimony whereof I have affixed my signature in presence of twoWitnesses.

JAMES E. TREAT.

Witnesses: ALBAN ANDREN, HENRY CHADBOURN.

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